.babelrc

{
  "presets": [
    "react", "es2015", "stage-2"
  ],
  "env": {
    "development": {
      "presets": [
        "power-assert"
      ],
      "sourceMaps": "inline"
    },
    "production": {
      "plugins": [
        "babel-plugin-unassert"
      ],
      "sourceMaps": false
    }
  }
}